diff options
| author | Li Zefan <[email protected]> | 2010-08-23 16:50:12 +0800 |
|---|---|---|
| committer | Steven Rostedt <[email protected]> | 2010-08-31 16:46:23 -0400 |
| commit | 3aaba20f26f58843e8f20611e5c0b1c06954310f (patch) | |
| tree | ad15d7aa21af465ddf6091eb490d84312089f245 /lib/string_helpers.c | |
| parent | fa66f07aa1f0950e1dc78b7ab39728b3f8aa77a1 (diff) | |
tracing: Fix a race in function profile
While we are reading trace_stat/functionX and someone just
disabled function_profile at that time, we can trigger this:
divide error: 0000 [#1] PREEMPT SMP
...
EIP is at function_stat_show+0x90/0x230
...
This fix just takes the ftrace_profile_lock and checks if
rec->counter is 0. If it's 0, we know the profile buffer
has been reset.
Signed-off-by: Li Zefan <[email protected]>
Cc: [email protected]
LKML-Reference: <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions